Editor's Choice Pictures

An aerial view of a burned tract of Amazon jungle as it was cleared by loggers and farmers near Porto Velho, Brazil August 29. REUTERS/Ricardo Moraes

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Thursday, August 29, 2019

An aerial view of a burned tract of Amazon jungle as it was cleared by loggers and farmers near Porto Velho, Brazil August 29. REUTERS/Ricardo Moraes

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Life jackets float on the water during a training exercise by the German NGO Sea-Eye migrant rescue ship 'Alan Kurdi' while on its way to the search and rescue zone off the North African coast, in the western Mediterranean Sea, August 29....more

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Thursday, August 29, 2019

Life jackets float on the water during a training exercise by the German NGO Sea-Eye migrant rescue ship 'Alan Kurdi' while on its way to the search and rescue zone off the North African coast, in the western Mediterranean Sea, August 29. REUTERS/Darrin Zammit Lupi

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Pinnacle Charter School high school student Zoe Marie Musser (R) practices taking down a shooter during training for an active shooter situation in a school in Thornton, Colorado, August 28. REUTERS/Rick Wilking

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Thursday, August 29, 2019

Pinnacle Charter School high school student Zoe Marie Musser (R) practices taking down a shooter during training for an active shooter situation in a school in Thornton, Colorado, August 28. REUTERS/Rick Wilking

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A boy stands beside the Bodo river in Kanga Nianze village, built on a former slave route, near Tiassale, Ivory Coast, July 15. Men and women captured in Ivory Coast and sold into slavery 400 years ago would take their final bath in the river before...more

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Thursday, August 29, 2019

A boy stands beside the Bodo river in Kanga Nianze village, built on a former slave route, near Tiassale, Ivory Coast, July 15. Men and women captured in Ivory Coast and sold into slavery 400 years ago would take their final bath in the river before being loaded onto ships. REUTERS/Luc Gnago

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Troops are seen at the Shek Kong military base of People's Liberation Army (PLA) in New Territories, Hong Kong, China August 29. REUTERS/Staff

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Thursday, August 29, 2019

Troops are seen at the Shek Kong military base of People's Liberation Army (PLA) in New Territories, Hong Kong, China August 29. REUTERS/Staff

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Naomi Osaka of Japan hits to Magda Linette of Poland in the second round on day four of the 2019 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center in New York. Danielle Parhizkaran-USA TODAY Sports

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Thursday, August 29, 2019

Naomi Osaka of Japan hits to Magda Linette of Poland in the second round on day four of the 2019 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center in New York. Danielle Parhizkaran-USA TODAY Sports

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Lava spurts from the Stromboli volcano a day after an eruption unleashed a plume of smoke on the Italian island of Stromboli, Italy, August 30. REUTERS/Antonio Parrinello

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Thursday, August 29, 2019

Lava spurts from the Stromboli volcano a day after an eruption unleashed a plume of smoke on the Italian island of Stromboli, Italy, August 30. REUTERS/Antonio Parrinello

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Southern separatist fighters patrol a road during clashes with government forces in Aden, Yemen August 29. REUTERS/Fawaz Salman

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Thursday, August 29, 2019

Southern separatist fighters patrol a road during clashes with government forces in Aden, Yemen August 29. REUTERS/Fawaz Salman

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An aerial view of Amazon jungle amid fire smoke as a track of it was cleared by loggers and farmers near Porto Velho, Brazil August 29. REUTERS/Ricardo Moraes

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Thursday, August 29, 2019

An aerial view of Amazon jungle amid fire smoke as a track of it was cleared by loggers and farmers near Porto Velho, Brazil August 29. REUTERS/Ricardo Moraes

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An activist holding a placard that reads "where is socialism for the road", stands atop of a vehicle in front of the marked trees which will be cut down for road expansion during a protest against the unplanned urbanization in Kathmandu, Nepal August...more

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Thursday, August 29, 2019

An activist holding a placard that reads "where is socialism for the road", stands atop of a vehicle in front of the marked trees which will be cut down for road expansion during a protest against the unplanned urbanization in Kathmandu, Nepal August 29. REUTERS/Navesh Chitrakar

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A Palestinian boy bids farewell to his uncle, before the boy leaves Gaza with his mother, at Rafah border crossing in the southern Gaza Strip July 8. REUTERS/Mohammed Salem

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Thursday, August 29, 2019

A Palestinian boy bids farewell to his uncle, before the boy leaves Gaza with his mother, at Rafah border crossing in the southern Gaza Strip July 8. REUTERS/Mohammed Salem

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A satellite image shows what U.S. officials say is the failed Iranian rocket launch at the Imam Khomeini Space Center in northern Iran August 29. Maxar Technologies/Handout via REUTERS

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Thursday, August 29, 2019

A satellite image shows what U.S. officials say is the failed Iranian rocket launch at the Imam Khomeini Space Center in northern Iran August 29. Maxar Technologies/Handout via REUTERS

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Joe Emery, TAC*ONE trainer and former Las Vegas police department sergeant, speaks to kindergarten students at Pinnacle Charter School during TAC*ONE training for an active shooter situation in a school in Thornton, Colorado, August 29. REUTERS/Rick...more

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Thursday, August 29, 2019

Joe Emery, TAC*ONE trainer and former Las Vegas police department sergeant, speaks to kindergarten students at Pinnacle Charter School during TAC*ONE training for an active shooter situation in a school in Thornton, Colorado, August 29. REUTERS/Rick Wilking

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People sit in water after being covered with mud, which helps to treat the skin diseases, on banks of Tigris river west of Mosul, Iraq August 20. REUTERS/Abdullah Rashid

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Thursday, August 29, 2019

People sit in water after being covered with mud, which helps to treat the skin diseases, on banks of Tigris river west of Mosul, Iraq August 20. REUTERS/Abdullah Rashid

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Bees return from a meadow to a beehive at a private apiary of beekeeper Pyotr Goloburdo outside the remote Siberian village of Volny near Krasnoyarsk, Russia August 28. REUTERS/Ilya Naymushin

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Thursday, August 29, 2019

Bees return from a meadow to a beehive at a private apiary of beekeeper Pyotr Goloburdo outside the remote Siberian village of Volny near Krasnoyarsk, Russia August 28. REUTERS/Ilya Naymushin

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An aerial view of a burning tract of Amazon jungle as it is cleared by loggers and farmers near Porto Velho, Brazil August 29. REUTERS/Ricardo Moraes

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Thursday, August 29, 2019

An aerial view of a burning tract of Amazon jungle as it is cleared by loggers and farmers near Porto Velho, Brazil August 29. REUTERS/Ricardo Moraes

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Actor Scarlett Johansson poses before the screening of the film "Marriage Story" during the Venice Film Festival. REUTERS/Yara Nardi

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Thursday, August 29, 2019

Actor Scarlett Johansson poses before the screening of the film "Marriage Story" during the Venice Film Festival. REUTERS/Yara Nardi

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Boca Juniors fans during the match between Boca Juniors and LDU Quito in Buenos Aires, August 28. REUTERS/Agustin Marcarian

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Wednesday, August 28, 2019

Boca Juniors fans during the match between Boca Juniors and LDU Quito in Buenos Aires, August 28. REUTERS/Agustin Marcarian

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President Donald Trump stands with General John Raymond, incoming U.S. Space Command commander, during an event to officially launch the United States Space Command in the Rose Garden of the White House in Washington, August 29. REUTERS/Kevin...more

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Thursday, August 29, 2019

President Donald Trump stands with General John Raymond, incoming U.S. Space Command commander, during an event to officially launch the United States Space Command in the Rose Garden of the White House in Washington, August 29. REUTERS/Kevin Lamarque

A shrine is seen on a beach where thousands of African slaves were once loaded onto ships in the historic slave port of Ouidah, Benin, July 17. REUTERS/Afolabi Sotunde

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Thursday, August 29, 2019

A shrine is seen on a beach where thousands of African slaves were once loaded onto ships in the historic slave port of Ouidah, Benin, July 17. REUTERS/Afolabi Sotunde

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A migrant leaves the Spanish military ship 'Audaz' after arriving from an Italian port, following a prolonged standoff between Italian authorities and Spanish-registered private rescue boat 'Open Arms', at a port in San Roque, near Algeciras, Spain...more

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Friday, August 30, 2019

A migrant leaves the Spanish military ship 'Audaz' after arriving from an Italian port, following a prolonged standoff between Italian authorities and Spanish-registered private rescue boat 'Open Arms', at a port in San Roque, near Algeciras, Spain August 30. REUTERS/Jon Nazca

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Pro-democracy activists Joshua Wong and Agnes Chow arrive at the Eastern Court by police van after being arrested on suspicion for organizing illegal protests, in Hong Kong, China August 30. REUTERS/Tyrone Siu

Reuters /
Friday, August 30, 2019

Pro-democracy activists Joshua Wong and Agnes Chow arrive at the Eastern Court by police van after being arrested on suspicion for organizing illegal protests, in Hong Kong, China August 30. REUTERS/Tyrone Siu

Hong Kong pro-democracy protesters take to the hills to form flashlight-carrying human chains during the Mid-Autumn Festival, a day when families traditionally gather to gaze at the moon and eat mooncakes while children swing colorful lanterns.

Southeast Asia has suffered for years from annual bouts of smoke caused by slash-and-burn clearances of forests for farms and palm oil plantation land, raising worries about public health and the impact on tourism.

An unprecedented surge in wildfires has occurred since Brazil's right-wing President Jair Bolsonaro took office in January vowing to develop the Amazon region for farming and mining, ignoring international concern over increased deforestation.

Some of the 10 Democratic presidential candidates meeting in their third debate took shots at front-runner Joe Biden, while others called for unity during a night dominated by questions around race, guns and healthcare. Here is a look at how each of the top 10 candidates did in the Houston debate.

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